Earthmoving Machine Blade Load Control Mode Switching
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Solution Overview
Problem
Existing earthmoving machine systems require significant user input and attention, leading to operator fatigue and inefficiencies in tasks like dozing, where automation is partially implemented but still relies heavily on manual intervention.
Innovation Solution
A system that automatically adjusts blade or bucket control modes based on detected machine states and operator commands, allowing for either load protection in light dozing or productivity optimization in heavy dozing, using a controller to determine the appropriate mode and assist the operator in maintaining desired operating points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic tool control is implemented, then operator fatigue is reduced and efficiency is improved, but the system complexity increases and requires sophisticated mode selection logic
Solution Approach 1:
The system dynamically switches between manual and automatic control modes based on real-time machine state and operator input detection. The controller transitions between modes seamlessly, providing adaptive automation that adjusts to current operational conditions rather than using a fixed control structure
Solution Approach 2:
The automatic mode detection system self-regulates by monitoring machine state and operator commands, automatically determining when to engage automatic control without requiring explicit operator initiation. The system serves itself by detecting its own operational context and adjusting control accordingly
2Reliability
If the work tool is automatically moved to adjust machine state, then undesirable machine states are prevented, but manual control authority is reduced
Solution Approach 1:
The system continuously monitors machine state and operator commands, using this feedback to determine when automatic intervention is appropriate. The controller detects operator intent and machine conditions, then applies automatic control only when needed to prevent undesirable states, maintaining a feedback loop that balances automation with operator authority
Solution Approach 2:
Automatic control is applied selectively to specific aspects of tool operation only when undesirable machine states are detected, rather than controlling all tool movements. Manual control remains active for normal operations, with automatic intervention localized to specific corrective actions
3Productivity
If the blade load is controlled toward target operating state, then productivity is optimized in heavy dozing, but the system requires continuous monitoring and adjustment
Solution Approach 1:
The automatic blade control system monitors machine state and automatically adjusts blade load toward the target operating state without requiring continuous operator intervention. The system serves itself by detecting deviations from optimal performance and self-correcting, eliminating the need for constant manual monitoring
Solution Approach 2:
Manual monitoring and adjustment actions are replaced with an automated control system that uses sensors and controllers to continuously manage blade load. The mechanical control system is augmented with electronic automation that performs monitoring and adjustment functions previously requiring operator attention
Data Source
AI summary
A system and method are provided for assisting a machine operator in controlling a work tool of the machine. In an embodiment, the work tool is set at a first height and the machine is travelling at a first machine speed, resulting in a first work tool or machine load. Based on these factors, a first work tool control mode or second work tool control mode is chosen. In the first work tool control mode, the work tool is manually controlled within a load limit and a work tool height limit, whereas in the second work tool control mode, the work tool load is controlled toward the first work tool load. Based on operator inputs and machine state, as well as other factors such as ground surface, the machine may switch between control modes, or out of automatic work tool control entirely.